Method for evaluating process characteristics of injection-molding tools

Abstract

The invention relates to a method for qualitatively and / or quantitatively classifying injection-molding tools in tool categories and determining preferred intervention ranges and / or manipulated variables for adapting injection-molding machine parameters in the case of changing ambient conditions and / or determining the influence of disturbing effects on the injection-molding process, comprising the following steps: a) providing an injection-molding machine having the injection-molding tool which is to be classified and which is intended for the determination, b) performing at least one injection-molding cycle with injection-molding machine settings in order to obtain a qualitatively adequate injection-molding part, c) determining a quotient Q=[delta]p / [delta]s or Q=[delta]sn / [delta]se characterizing the tool from c.1) a pressure rise [delta]p during the compression phase of the injection-molding cycle and the melt volume [delta]V displaced during the compression phase or c.2) a melt volume [delta]Vn displaced during the holding-pressure phase and the melt volume [delta]Ve displaced during the injection phase, wherein c.3) the corresponding screw travel [delta]s, [delta]sn, and [delta]se is measured in order to determine the displaced volumes [delta]V, [delta]Vn, and [delta];Ve, d) providing at least one limit value (G1...Gx...Gn), wherein one or more recommendations for preferred intervention ranges or manipulated variables for adapting adjustment parameters of the injection-molding machine are associated with ranges (Q < G1; G1 < Q < G2;... Gn-1 < Q < Gn; Q > Gn) for the values of the quotient Q, e) determining in which of the ranges (Q < G1; G1 < Q < G2;... Gn-1 < Q < Gn; Q > Gn) the value of the quotient Q lies, and f) outputting the preferred intervention ranges and / or manipulated variables for adapting the machine parameters of the injection-molding machine which are associated with the determined range.

Description

technical field [0001] The invention relates to a method for qualitatively and / or quantitatively evaluating the technological properties of injection molding tools in the sense of classifying them into mold categories. Based on this, preferred intervention ranges and / or manipulated variables are determined for adapting the injection molding machine parameters and / or the influence of disturbance effects on the injection molding process in the event of changing ambient conditions. Background technique [0002] The injection molding process, which has been ideally set for an injection molding machine with a specific mold for the production of a specific molded part, often runs into fluctuations during cycle operation, which are due to changing environmental conditions and / or disturbance effects on the Influence of the injection molding process. Such changing environmental conditions may be, for example: [0003] - Changes in the workshop temperature in the workshop where the ...

AI Technical Summary

Problems solved by technology

But this results in the need for an additional pressure sensor in the mold cavity

It has been found with such pressure sensors that, on the one hand, they are cost-intensive to install and result in high maintenance effort in the area of ​​mold maintenance.

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